Brush-holder for dynamo-electric machines.



APPLICATION FILED MAY 21. 1906.

Patented Aug. 3, 1909.

INVENTOR I ATTORNEY WITNESSES':

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following is a specification;

UNITEI) "STATES;

'FRANK w. GARRETT, or PITJSBURG, PEirNsY VA'NIA,issie voaro w isriiecfl "enno'rnic a MANUFACTURING COMPANY, A oonron-A'rion oi ril BRUSH-HOLDER Fen DYNAMO- ELEGTBIO ivriiennvn To all whom it may concern. I

, Be it known that I, FRANK'VV. GARRETT, a Q citizen of the United States, and aresident of Pittsburg, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Im rovement inBrush-Holders for Dynamo-E ectric Machines, of which the j My invention relates to brush holders for d namoeelectric machines and it'has for its 0 ject to provide means for detachably 0on necting one end of a flexible sh unt to a brush holder that shall si 'n-ple and durable in construction and shall insure a goodelectrical connection between the shun t and the holder.

, In brush holders or current collectors having sliding brushes which are held in engage- 1119-05 with a rotating surface by spring presit hasusually been found desirable to connect the brush to the holder. in which it operates by means of a flexible sh nut in order that the sprin' ressure mechanism may not be overheatet y the assage of electrical currents through. it. hunts of' this kind have usually been rigidly attached to the brush itself and have been connected to the brush holder by means of a suitable binding screw. Some machines, however, of which railway motors form good examples, are so located'in service that it is diilicult to use a screw-driver or similar tool for detaching the shunt connection from the brush holder, Since it is often'necessar particularly in machines of the aforesaid c sure,

ass, to replace the brushes, and since it is desirable that the. change may time, I provide an iinroved connection between the flexible s unt and. the brush holder which insures a good electrical connection, irrespective of the vibrations to which it may be subjected, and which may readily be manually detached and replaced without i necessitating theuse of any tools.

In the accompanying drawingaFigure .1 is a view, mainly in side elevation, but partially in section, of a brush holder embodying my invention, and Fig. 2 is a sectional view on the line IIII'of Fig. 1.

Referring to the drawings the brush holder illustrated com rises a carbon-box 1, in which a-brush 2 is inovably mounted, a [lexible shunt 3, a spring-pressure mechanism 4, and sup orting studs 5.

The exible shunt 3 may be attached to the brush 2 by any convenient means, such Specification of Letters Patent I Application filed May 21, 1906. Serial No.'318,016, i

terfere v.ith the pres be accomplished in a very short a the connector is accentuated.

' tained between sYi VAN-i i the brush near one orn acts, near the cente' of't brush. Fhe support" stantially cylindrical, a tion and areprovide lain or other suitable 1 thin metal which protects insulating material.

The pressure mechanism 4 may be of any suitable form and comprises, as illustrated, a spiral spring 9 which is so arran ed as to exert a downward pressure througi a linger 10 upon the brush 2. A'guide 11, which may be an integral. part of the frame, extends from the carbon-box 1 and so engages the outerturn of the spring '9 that all its turns are held substantially in concentric relation to each other andto a shaft 12 about which it is coiled.

The brush holder frame is provided with a Web 13, the outer edges of which are provided with an indentation 14' across which a flat spring 1,5extends. A pair of ears 16 extend outwardly from thc'center of the web 13 at ater'i hth'of the wrapping of the sides of the indentation and are provided with a rod or pin 17. The flat spring 15 is fastened at one end to the top of the web 13 by a binding screw 18 and extends between the cars 15. In. this way, a loop is provided above the spring which may be engaged by a hooked cam connector 19,which is attached to the free end of the flexible shunt 3. The outer surface of the hooked end of the cam 19 is flattened and the size and arrangement of parts are such that when the hook engages the pin 17 the .spring 15 forces the hook against the pin and the normal position of By making the spring 15 of sufiicient strength/agood connection may be mainthe connector 19 and the brush holder and this connection will not be impaired when the holder issubjeeted to serv ice conditions.

I claim as my invention:

1. In a current-collecting device, the combination with a brush and a holder having a loo of a shunt connector having one end attached to the brush and having a hook at its other end, and a spring for holdingthe hook in engagement with the loop.

2. In a current-collecting device, the coinbination with a brush and a holder having from the holder, 9, cross pm supported by the I prising a cam hook attached to projecting ears, and a pin su )ported by the ears, of a flexible conductor having one end attached to the brush and having a hooked teljn-iinal at its other end to engage the pin.

3. In a current-collecting device, the comhinatioh \vith'a brush, a holder, and a flexible conductor one end of which is attached to the brush, of a detachable connection between the flexible conductor and the holder comthe free end of the conductor, a loop on said holder, and means for holding the hook in engagement with the loop.

4. Ina current-c0lleeting device, the combination with a brush, a holder, an d a flexible conductor one end of which is attached to the-brush, of a detachable connection between the flexible conductor and the holder comprising a cam hook attached to the free end of the conductor, ears which project terminal, and a spring ears and engaged by the cam hook and a s 'n'ing betueen theears whichforces the hook against the pin A d tachable electrical connection comprising a hook terminal, a cooperating loop x'hiclfiehgages the outer side of the hook terminal to hold its inner side in engagement minal;

prisii-rg a hook terminal, a loop terminal, and a llat spring projecting through the loop and serving to force the hook into engagement with its outer portion. I a; M

.In testimony,WhereM, I have-v hereunto subscribed my nanie this 19th day of May, 1906. a i FRANK W. GARRETT. Witnesses: I I

.los. M. Davis, BJRNI'JY l-lirucs with the; loop ter- I v i (5. A detachable electrical connection eom- 

